Vehicle control device, and vehicle control method

a control device and vehicle technology, applied in the direction of cycle equipment, instruments, transportation and packaging, etc., can solve the problem of lowering the accuracy of stroke speed estimation, and achieve the effect of stable vehicle body orientation, low accuracy of estimation, and stable vehicle body orientation

Active Publication Date: 2015-02-12
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Benefits of technology

[0008]Therefore, it can be detected when low accuracy of estimation in the sprung mass state has arisen, and situations in which control continues while the accuracy of estimation remains lower can be avoided. Moreover, situations in which control is performed incorrectly due to the limited damping force control performed when the accuracy of estimation is low can be minimized, and a stable vehicle body orientation can be achieved.

Problems solved by technology

However, a problem encountered in the aforementioned prior art is that when a disturbance of wheel speed arises within the predetermined frequency region, the accuracy of estimation of the stroke speed is lowered.

Method used

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  • Vehicle control device, and vehicle control method
  • Vehicle control device, and vehicle control method
  • Vehicle control device, and vehicle control method

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first embodiment

[0035]FIG. 1 is a schematic system diagram showing a vehicle control device according to a first embodiment. A vehicle comprises an engine 1 constituting a power source, brakes 20 for generating braking torque by applying frictional force to the wheels (brakes corresponding to individual wheels will be referred to hereafter as follows: front right brake: 20FR; front left brake: 20FL; rear right brake: 20RR; rear left brake: 20RL), and shock absorbers 3 capable of variable damping force control, provided between each of the wheels and the vehicle body (“shock absorber” will be abbreviated “S / A” in the following description, and S / A corresponding to individual wheels will be referred to as follows: front right S / A: 3FR; front left S / A: 3FL; rear right S / A: 3RR; rear left S / A: 3RL).

[0036]The engine 1 has an engine controller (also referred to hereinafter as an engine control unit, and corresponding to the power source control means) 1a. The engine controller la controls the engine oper...

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Abstract

A vehicle control device includes a sensor and a controller. The sensor detects wheel speed. The controller estimates sprung mass state based on detected information in a prescribed frequency range. The controller controls a variable-damping force shock absorber to bring the estimated sprung mass state to a target sprung mass state. The controller estimates wheel rim braking/drive torque acting on a wheel. The controller determines the estimation accuracy of the sprung mass state has deteriorated when a rate of change of a stationary component extracted from components of wheel rim braking/drive torque acting on a wheel is detected to equal or exceed a prescribed value. The controller controls the variable-damping force shock absorber to a more limited extent than when the estimation accuracy has not deteriorated.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a U.S. National stage application of International Application No. PCT / JP2013 / 063240, filed May 13, 2013, which claims priority to Japanese Patent Application No. 2012-110303 filed in Japan on May 14, 2012 and Japanese Patent Application No. 2012-110304 filed in Japan on May 14, 2012.BACKGROUND[0002]1. Field of the Invention[0003]The present invention relates to a control device and a control method for controlling the state of a vehicle.[0004]2. Background Information[0005]Japanese Laid-Open Patent Application No. 2009-241813 discloses a technology for estimating stroke speed from fluctuations in wheel speed in a predetermined frequency region, and modifying the damping force of a variable damping force shock absorber in accordance with the stroke speed, to control the sprung behavior.SUMMARY[0006]However, a problem encountered in the aforementioned prior art is that when a disturbance of wheel speed arises within the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60W30/02B60T7/12B60G17/0195
CPCB60W30/02B60T7/12B60G17/0195B60G17/018B60G17/0182B60G17/0185B60G17/06B60G2400/204B60G2400/41B60G2400/64B60G2600/08B60G2600/084B60G2600/604B60G2800/70B60G2800/802B60G2800/916B60W10/06B60W10/184B60W10/22B60W2030/206B60W2520/14B60W2540/18B60W2710/0666B60W2710/223B60W2710/226
Inventor KIKUCHI, HIRONOBU
Owner NISSAN MOTOR CO LTD
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